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How do I activate XP using Windows 7 Product Key for downgrade? (For Boot Camp on a Mac)

Last Modified: 2013-11-11
I was told by two computer stores that I can still install Windows XP Pro if I purchase Windows 7 Premium and use the Product Key to activate XP. But I am at the point in the XP Pro installation and the Win 7 PK doesn't work and to my real surprise the XP PK doesn't work.

What are the proper steps to install XP as a downgrade of Win 7? And any ideas why the PK for Win XP Pro (OEM) won't work and let me finish the installation?


PS: I am doing this on a MacBook Pro as part of a Boot Camp 3.0 installation. But I'm not sure that should matter.
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